Pocket Watch Database

From the American Horology Archive:

Ball - Hamilton

Grade: 999P

Manufacturer: Ball - Hamilton Question Mark
Movement Serial Number: B644639 Question Mark
Grade: 999P Question Mark
Model: 1 Question Mark
Estimated Production Year: 1937 Question Mark
Run Quantity: 2,000 Question Mark
Grade/Model Run: 12 of 15 Question Mark
Grade/Model Total Production: 40,300 Question Mark
Size: 16s Question Mark
Jewels: 21j Question Mark
Movement Configuration: Openface Question Mark
Movement Finish: Nickel Question Mark
Finish Pattern: Circular Question Mark
Movement Setting: Lever Question Mark
Plate: 3/4 Plate Question Mark
Barrel: Going Question Mark
Adjusted: Yes Question Mark
Adjusted # of Positions: 5 Question Mark
Adjusted to Temperature: Yes Question Mark
Railroad Grade: Yes Question Mark
U.S. Patents: D32330 Question Mark
Movement Markings: Official Standard
Ball Watch Co.
Cleveland,O.
21 Jewels
Adjusted
5 Positions
Sapphire Pallets
Trade Mark
Case: Various Question Mark
Database Version: v52.517 Question Mark
Advanced Metrics
PWDB Absolute Rarity Index:
Scoped for Grade/Size/Model/Configuration
121.33 Question Mark
PWDB Relative Rarity Index:
Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration
916.84 Question Mark
Share of Production:
Share within Manufacturer - Scoped for Grade/Size/Model/Configuration
34.934% Question Mark
Registry Population:
Scoped for This Run Only
8 (0.40%) Question Mark
Research Note: Hamilton Hairspring Stud

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Verification Reports for this Run

The following reports have been graciously submitted by dedicated members in reference to this production run. These reports are useful to verify data and track inaccuracies that require further research. Please note that reports may contain inaccurate information or assumptions that must be dilligently considered with other available sources.


cjbrem Supporter 957 · July 29, 2023

Serial Number B644441 was reported as accurate.

Anonymous · March 15, 2022

Serial Number B645086 was reported as accurate.

Anonymous · February 1, 2022

Serial Number B645245 was reported as accurate.

Anonymous · August 9, 2021

Serial Number B644803 was reported as accurate.

Anonymous · April 12, 2021

Serial Number B645705 was reported as accurate.

Anonymous · March 5, 2021

Serial Number B644047 was reported as accurate.

Anonymous · January 11, 2021

Serial Number B645505 was reported as accurate.

Anonymous · December 19, 2020

Serial Number B644511 was reported as accurate.

Anonymous · May 30, 2020

Serial Number B645263 was reported as accurate.

Anonymous · March 14, 2020

Serial Number B644367 was reported as accurate.

Anonymous · January 3, 2020

Serial Number B645654 was reported as accurate.

Anonymous · December 28, 2019

Serial Number B644436 was reported as accurate.

Anonymous · October 28, 2019

Serial Number B645534 was reported as accurate.

Anonymous · October 28, 2019

Serial Number B645500 was reported as accurate.

Anonymous · June 16, 2019

Serial Number B644669 was reported as accurate.

Anonymous · April 10, 2019

Serial Number B644869 was reported as accurate.

Anonymous · March 14, 2019

Serial Number B644658 was reported as accurate.

Anonymous · February 8, 2019

Serial Number B644397 was reported as accurate.

Anonymous · September 23, 2018

Serial Number B644953 was reported as accurate.

Anonymous · September 18, 2018

Serial Number B644953 was reported as accurate.

Anonymous · October 8, 2017

Serial Number B645392 was reported as accurate.

Anonymous · May 24, 2017

Serial Number B645376 was reported as accurate.

Gasperoff Supporter 727 · September 9, 2016

Serial Number B645579 was reported as accurate.

Gasperoff Supporter 727 · September 9, 2016

Serial Number B645579 was reported as accurate.

Anonymous · August 7, 2016

Serial Number B645614 was reported as accurate.

Anonymous · July 23, 2016

Serial Number B644038 was reported as accurate.

Anonymous · June 13, 2016

Serial Number B644977 was reported as accurate.

Anonymous · June 8, 2016

Serial Number B644977 was reported as accurate.

Anonymous · May 23, 2016

Serial Number B644639 was reported as accurate.

Anonymous · May 8, 2016

Serial Number B644038 was reported as accurate.

Anonymous · December 28, 2015

Serial Number B645087 was reported as accurate.

Anonymous · July 11, 2015

Serial Number B644292 was reported as accurate.

Richantiques 10 · October 29, 2014

Serial Number B644205 was reported as accurate.

Anonymous · August 4, 2014

Serial Number B644875 was reported as accurate.

Mobilaero Top Contributor Supporter 307 · April 12, 2014

Serial Number B644242 was reported as accurate.

Anonymous · March 30, 2014

Serial Number B645687 was reported as accurate.

Anonymous · December 3, 2013

Serial Number B644770 was reported as accurate.

Anonymous · December 3, 2013

Serial Number B644770 was reported as accurate.

captnemo101 Supporter 19 · June 16, 2013

Serial Number B644035 was reported as accurate.